Undersaturation
欠饱和, 未饱和
🗣️ 情景例句
Philip, why don't you go
Philip 你何不去
What shall I send him for his birthday?
我要送他什么东西作为生日礼物？
That's the trouble, vicar,' answered Bill.
“问题就在这里，牧师，”比尔回答说。